👉 The biggest fluid, when considering volume and mass, is water, but in a more fluid context, it's the oceans. The world's oceans contain approximately 97% of Earth's water, making them the largest reservoir of this essential resource. This vast body of saltwater not only plays a crucial role in regulating the planet's climate and weather patterns but also supports an immense variety of marine life, accounting for about 97% of all known species on Earth. The sheer volume of water in the oceans is staggering, with an estimated 1.332 billion cubic kilometers (252,000 cubic miles) of water, dwarfing all other bodies of water combined.
